Soundproof Box
Function and Purpose:
The soundproof box provides an extremely quiet environment for noise testing, free from interference by external noise and vibrations. Additionally, it offers a free or semi-free sound field that meets specific evaluation criteria.
A standardized noise measurement environment must meet three key requirements:
Low Background Noise: Ensuring minimal ambient noise interference.
Low Cutoff Frequency: Ensuring the test chamber can effectively measure low-frequency sounds.
Relatively Large Free or Semi-Free Sound Field: Providing a space conducive to accurate and reliable sound measurements.
Only full anechoic chambers or semi-anechoic chambers can meet these three conditions simultaneously.
Acoustic Test Box vs. Anechoic Chamber：
| Comparison Item | Anechoic Chamber | Conventional Acoustic Test Box | Zhongke Shengxuan Acoustic Test Box |
| Background Noise | The world’s top three anechoic chambers with the lowest background noise: 1st – USA, -20.3 dB(A); 2nd – USA, -9 dB(A); 3rd – China, -8.4 dB(A) | ＞20dB(A) | -1dB(A) |
| Cutoff Frequency | Conventional chambers typically have a cutoff frequency of 100 Hz; high-precision chambers can achieve 50 Hz. | ＞300Hz | 150Hz |
| Free Field Radius | Depends on the space size; can reach up to tens of meters. | Depends on size | Depends on size |
| Space Size | Large space, cannot be deployed on production lines. | Small space, can be flexibly deployed on production lines or in labs. | Small space, can be flexibly deployed on production lines or in labs. |
| Standards | Meets national and international measurement standards. | No specific standards | No specific standards |
| Application Scenarios | Laboratories | Laboratories, production workshops | Laboratories, production workshops |
| Automation Level | Cannot achieve automated testing. | Can achieve automated testing. | Can achieve automated testing. |
Product Parameters and Configuration
【Functional Parameters】
Background Noise: Customized production, minimum achievable -1 dB(A), frequency range 20 Hz ~ 20 kHz
Cutoff Frequency: Customized production, minimum achievable 150 Hz cutoff frequency
Free Field Radius: Customized production, depends on the dimensions of the test object and the allowable size of the box
Measurement Accuracy Error: ±1.5 dB(A) (refers to the unavoidable measurement error caused by the acoustic field characteristics of the test box itself, not the errors introduced by the microphone, data acquisition card, or acoustic signal analysis software)
【Configuration】：
Material entry/exit doors
Maintenance door
Lighting
Monitoring (optional)
Cable pass-through channel
Internal tooling fixtures (customizable)
Automation level (customizable)
Space dimensions (customizable)
Scenario application
Auto parts
The noise test box is mainly used to test the noise, vibration, NVH, etc. of automobile parts. Tested products include engines, car seat drives, displays, car actuators, air conditioning systems, etc. Through the noise test box, automobile manufacturers can carry out effective noise control and optimization during the design and development process, improving the overall quality and user experience of the vehicle.
3C electronics field
The noise test box is mainly used to test the noise, vibration, sound pressure level, etc. of 3C products. Tested products include smartphones, headphones, speakers, computer fans, tablets, micro motors, etc. Through the noise test box, 3C electronic product manufacturers can effectively monitor and control product noise to ensure their competitiveness in the market and user satisfaction.
Medical device
The noise test box is mainly used to test the noise, abnormal sound, sound quality, etc. of medical equipment. Products tested include ventilators, dental equipment, surgical machinery, monitors and more. With noise test chambers, medical device manufacturers can ensure that their products do not produce excessive noise when in use, thereby improving patient comfort and device reliability.
Home appliance field
Noise test boxes are mainly used to test noise, vibration, sound quality, etc. in the field of home appliances. Test products include air conditioners, vacuum cleaners, refrigerators, washing machines, etc. Through the noise test box, home appliance manufacturers can effectively control product noise to ensure their competitiveness in the market and user satisfaction.
Chinese 
Thai